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Ductility enhancement in NiAl (B2)-base alloys by microstructural control

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Abstract

An attempt to improve ductility of NiAl (B2)-base alloys has been made by the addition of alloying elements and the control of microstructure. It has been found that a small amount of fccγ phase formed by the addition of Fe, Co, and Cr has a drastic effect not only on the hot workability but also on the tensile ductility at room temperature. The enhancement in ductility is mainly due to the modification of Β-phase grains by the coexistence ofγ phase. The effect of alloying elements on the hot forming ability is strongly related to the phase equilibria and partition behavior amongγ,γ′ (L12 structure), and Β phases in the Ni-Al-X alloy systems. The ductility-enhancement method shows promise for expanding the practical application of nickel aluminide.

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Authors and Affiliations

  1. Department of Materials Science Faculty of Engineering, Tohoku University, 980, Sendai, Japan

    K. Ishida (Associate Professor), R. Kainuma (Research Associate), N. Ueno (Graduate Student) & T. Nishizawa (Professor)

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  1. K. Ishida
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  2. R. Kainuma
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  3. N. Ueno
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  4. T. Nishizawa
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Ishida, K., Kainuma, R., Ueno, N. et al. Ductility enhancement in NiAl (B2)-base alloys by microstructural control. Metall Trans A 22, 441–446 (1991). https://doi.org/10.1007/BF02656811

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  • DOI: https://doi.org/10.1007/BF02656811

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